title: Structure of the extracellular polysaccharide secreted by Rhizobium leguminosarum var. phaseoli CIAT 899.
abstract: The structure of the extracellular polysaccharide secreted by Rhizobium leguminosarum var. phaseoli CIAT 899 has been studied by methylation analysis. 1H-n.m.r. spectroscopy, and partial acid hydrolysis. The repeating unit is an octasaccharide made up of D-glucose, D-galactose, pyruvic acid, and acetic acid in the molar ratios 6:2:1.5:1.5. Half of the terminal Gal groups are 4,6-substituted by pyruvic acid acetal groups and the other half by O-acetyl groups at position 3. Also, one of the 3-linked glucosyl residues carries a pyruvic acid 4,6-acetal group and one of the 4-linked glucosyl residues is acetylated at position 6.
authors.affiliation: Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Gil-Serrano
authors.forename: A
authors.initials: A
authors.lastname: Sanchez del Junco
authors.forename: P
authors.initials: P
authors.lastname: Tejero-Mateo
authors.forename: M
authors.initials: M
authors.lastname: Megias
authors.forename: M A
authors.initials: MA
authors.lastname: Caviedes
mesh_terms: D002240:Carbohydrate Sequence; D006868:Hydrolysis; D008745:Methylation; D008969:Molecular Sequence Data; D011135:Polysaccharides, Bacterial / Q000737:chemistry* / Q000378:metabolism; D012231:Rhizobium / Q000378:metabolism*
chemical_list: D011135:Polysaccharides, Bacterial